#!/usr/bin/env python3
# SPDX-License-Identifier: LGPL-2.1-or-later

from __future__ import print_function

import os
import sys
import dbus
import dbus.service
import dbus.mainloop.glib
try:
  from gi.repository import GObject
except ImportError:
  import gobject as GObject
import bluezutils

PLAYER_IFACE =       'org.mpris.MediaPlayer2.Player'
DBUS_OM_IFACE =      'org.freedesktop.DBus.ObjectManager'
DBUS_PROP_IFACE =    'org.freedesktop.DBus.Properties'

class InvalidArgsException(dbus.exceptions.DBusException):
    _dbus_error_name = 'org.freedesktop.DBus.Error.InvalidArgs'

class Player(dbus.service.Object):
    def __init__(self, bus, path, obj):
        self.path = path
        dbus.service.Object.__init__(self, bus, self.path)

        if obj != None:
            mp = dbus.Interface(bus.get_object("org.bluez", obj),
                                                "org.bluez.MediaPlayer1")
            prop = dbus.Interface(bus.get_object("org.bluez", obj),
                                  "org.freedesktop.DBus.Properties")

            self.properties = prop.GetAll("org.bluez.MediaPlayer1")

            bus.add_signal_receiver(self.properties_changed, path = obj,
                            dbus_interface = "org.freedesktop.DBus.Properties",
                            signal_name = "PropertiesChanged")
        else:
            self.track = dbus.Dictionary({"xesam:title" : "Title",
                                     "xesam:artist" : ["Artist"],
                                     "xesam:album" : "Album",
                                     "xesam:genre" : ["Genre"],
                                     "xesam:trackNumber" : dbus.Int32(1),
                                     "mpris:length" : dbus.Int64(10000) },
                                     signature="sv")

            self.properties = dbus.Dictionary({"PlaybackStatus" : "playing",
                                        "Identity" : "SimplePlayer",
                                        "LoopStatus" : "None",
                                        "Rate" : dbus.Double(1.0),
                                        "Shuffle" : dbus.Boolean(False),
                                        "Metadata" : self.track,
                                        "Volume" : dbus.Double(1.0),
                                        "Position" : dbus.Int64(0),
                                        "MinimumRate" : dbus.Double(1.0),
                                        "MaximumRate" : dbus.Double(1.0),
                                        "CanGoNext" : dbus.Boolean(False),
                                        "CanGoPrevious" : dbus.Boolean(False),
                                        "CanPlay" : dbus.Boolean(False),
                                        "CanSeek" : dbus.Boolean(False),
                                        "CanControl" : dbus.Boolean(False),
                                        },
                                        signature="sv")

        print('Register media player with:\n\tProperties: %s' \
              % (self.properties))
        handler = InputHandler(self)
        GObject.io_add_watch(sys.stdin, GObject.IO_IN, handler.handle)

    @dbus.service.method("org.freedesktop.DBus.Properties",
                         in_signature="ssv", out_signature="")
    def Set(self, interface, key, value):
        print("Set (%s, %s)" % (key, value), file=sys.stderr)
        return

    def get_properties(self):
        return self.properties

    def get_path(self):
        return dbus.ObjectPath(self.path)

    @dbus.service.method("org.freedesktop.DBus.Properties",
                         in_signature='s', out_signature='a{sv}')
    def GetAll(self, interface):
        if interface != PLAYER_IFACE:
            raise InvalidArgsException()

        return self.get_properties()

    @dbus.service.signal("org.freedesktop.DBus.Properties",
                         signature="sa{sv}as")
    def PropertiesChanged(self, interface, properties,
                          invalidated = dbus.Array()):
        """PropertiesChanged(interface, properties, invalidated)

        Send a PropertiesChanged signal. 'properties' is a dictionary
        containing string parameters as specified in doc/media-api.rst.
        """
        pass

    def help(self, func):
        help(self.__class__.__dict__[func])

    def properties_changed(self, interface, properties, invalidated):
        print("properties_changed(%s, %s)" % (properties, invalidated))

        self.PropertiesChanged(interface, properties, invalidated)

class InputHandler:
    commands = { 'PropertiesChanged': '(interface, properties)',
                        'help': '(cmd)' }
    def __init__(self, player):
        self.player = player
        print('\n\nAvailable commands:')
        for cmd in self.commands:
                print('\t', cmd, self.commands[cmd], sep='')

        print("\nUse python syntax to pass arguments to available methods.\n" \
                "E.g.: PropertiesChanged({'Metadata' : {'Title': 'My title', \
                'Album': 'my album' }})")
        self.prompt()

    def prompt(self):
        print('\n>>> ', end='')
        sys.stdout.flush()

    def handle(self, fd, condition):
        s = os.read(fd.fileno(), 1024).strip()
        try:
            cmd = s[:s.find('(')]
            if not cmd in self.commands:
                print("Unknown command ", cmd)
        except ValueError:
            print("Malformed command")
            return True
        try:
            exec "self.player.%s" % s
        except Exception as e:
            print(e)
            pass
        self.prompt()
        return True

class Application(dbus.service.Object):
    def __init__(self, bus, path, obj):
        self.path = '/'
        self.players = []
        dbus.service.Object.__init__(self, bus, self.path)
        self.add_player(Player(bus, path, obj))

    def get_path(self):
        return dbus.ObjectPath(self.path)

    def add_player(self, player):
        self.players.append(player)

    @dbus.service.method(DBUS_OM_IFACE, out_signature='a{oa{sa{sv}}}')
    def GetManagedObjects(self):
        response = {}
        print('GetManagedObjects')

        for player in self.players:
            response[player.get_path()] = { PLAYER_IFACE:
                                            player.get_properties() }

        return response

def register_app_cb():
    print('Media application registered')


def register_app_error_cb(error):
    print('Failed to register application: ' + str(error))
    mainloop.quit()

if __name__ == '__main__':
    dbus.mainloop.glib.DBusGMainLoop(set_as_default=True)

    bus = dbus.SystemBus()

    if len(sys.argv) > 1:
        path = bluezutils.find_adapter(sys.argv[1]).object_path
    else:
        path = bluezutils.find_adapter().object_path

    media = dbus.Interface(bus.get_object("org.bluez", path),
                           "org.bluez.Media1")

    path = "/test/player"

    if len(sys.argv) > 2:
        app = Application(bus, path, sys.argv[2])
    else:
        app = Application(bus, path, None)

    mainloop = GObject.MainLoop()

    media.RegisterApplication(app.get_path(), {},
                                reply_handler=register_app_cb,
                                error_handler=register_app_error_cb)

    mainloop.run()
